Allow URI input form on replay to work without JS

[machawk1]

Per #412, we added a button to submit the form, which previously relied on hitting enter with a text field in focus. The conventional submission mechanism is currently suppressed via JS and handled via JS.

This should be more accessible. @ibnesayeed provided a mechanism to accomplish this in #412.

[ibnesayeed]

Direct link to the related comment #412 (comment).

[machawk1]

Added a fix for this in b0108ef and tested without JS.

When /memento/*/?url=foo.com was requested, the normal handler showMementosForURIRs(urir) with route /memento/*/<path:urir> is not called due to the path: requirement specification. Instead, show_uri(path, datetime=None) would be called with the more generic route.

Creating a path-less route of simply /memento/*/ then reading the query string and performing a redirect to showMementosForURIRs(urir) proved sufficient for reusing the function/route.